Changing content of a signed .exe

We build our product from C and Asm source files, and ship all our .exe and .dll files signed with Authenticode. In the past (before we starting signing our files), our customers could use a tool like ResHacker or Resource Tuner to change the app icon -- the icon that shows in Windows Explorer for an .exe file -- to something they like better than our icon.

The question now is how to support this capability in Authenticode signed file? Or is it simply impossible?

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